code-coverage – Page 4 – Türker Yıldırım

Coverage on a directory, not on a percentage

NoteFebruary 14, 20232 min read

A global threshold of 80% says nothing about whether the code that matters is tested, and it is satisfied by testing the code that is easy. Different code…

Readonly classes and the DTO that stopped needing a constructor

Deep diveDecember 20, 202210 min read

8.2 on 8 December, and readonly applied to a whole class. readonly on every property, written out forty times.

The dynamic property that had been a typo since 2016

Deep diveDecember 13, 202214 min read

8.2 on 8 December deprecates dynamic properties, and the deprecation is the feature. $order->totl has been silently creating a property for six years.

Running mutation testing on the diff, not the suite

NoteNovember 24, 20221 min read

A full mutation run takes long enough to be a nightly job, and running it on the changed lines makes it usable in a pull request. Gating on…

Coverage of a line is not coverage of a branch

NoteOctober 20, 20222 min read

Line coverage counts whether a line executed, and a line with two outcomes is fully covered by exercising one of them. Path coverage requires Xdebug rather than PCOV…

PHPUnit 9 to Pest, and the migration that was not worth it

Deep diveSeptember 30, 202210 min read

A trial on one suite, honestly reported. Nothing was wrong with the tests we had.

The test suite that took twelve minutes and now takes ninety seconds

Deep diveMarch 8, 202210 min read

Twelve minutes, six times a day, per developer. Nobody ran it locally, so it only ever failed in CI.

Testing a block theme without a browser

Deep diveFebruary 16, 202210 min read

A theme with no PHP has nothing a unit test can call, and the only test is a person looking at a page.

Static analysis at level 8, and the six months it took

Deep diveNovember 26, 202115 min read

1.0 in November after five years of 0.x. Level 0 passes and finds nothing anybody cared about; raising the level all at once does not work.

An escaped mutant is a finding; a killed one is noise

NoteNovember 26, 20202 min read

The score is a summary and the value is in the list of mutants that survived, each of which is a change to the code that no test…